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Comment by c-slice | Hacker News Reader

Fascinating post. I wonder if anyone has tried to decode the Audible audiobook format - ".aa"?

FFmpeg would seem to already have this: http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavformat/a...

For those who would like to decode an Audible AAX file with the FFmpeg binary itself, you may do so with the following:

    ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4

Taken from the docs. (http://ffmpeg.org/ffmpeg-all.html#Audible-AAX)

Is it reversible though?

I've downloaded so much junk from the internet trying to do this but just couldn't and now I find it's so simple! Again, Thanks for sharing it. Who would have thought it would be so simple.

THANK YOU!!! I have been wanting to backup my extensive audible library for years but could never find an easy solution.

edit: I have not tried it yet, but this script seems to extract the key from audible

https://github.com/inAudible-NG/audible-activator/blob/maste...

Spotify's ".file" has been a tough one to crack.

The only work I've seen on breaking Spotify DRM encryption was this[1], back in 2014 and discussed on HN here[2].

[1]: http://moyix.blogspot.com/2014/07/breaking-spotify-drm-with-... [2]:

That is...genius!

Apparently they actually tried unlike Grooveshark. [0] I don't think Grooveshark would have minded if someone cracked their "DRM" even while they were still in business. :)

[0]: http://lgms.nl/blog-1

I'd actually be more interested in the database files that Spotify uses to manage cached tracks on Android - at the moment the UI is terrible, especially when you have 200+ tracks downloaded and are running out of space on your device.

My goal is to write an 'ncdu' application to show what files/albums are using the most space.

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